Polished De Grussa copper ore CO105 atlantisite Totally replaced by colourful chert

Totally replaced by colourful chert

Dimensions at widest points approximately 85 mm

Dimensions at widest point approximately 140 mm x 75 mm x 40 mm

All reasonably uniform in size (roughly 20 - 25 mm diameter)

PC112 Chalcedony slab

Polished De Grussa copper ore CO105 atlantisite Totally replaced by colourful chertCO105 DeGrussa copper ore , cut and polished on one side with a natural rough back . Dimensions at widest points approximately 140 mm x 75 mm x 60 mm thick. Weighs: 1,638 grams A mix of copper minerals that formed in the upper oxidised zone. The Degrussa underground mine is a high grade copper deposit in Western Australia that commenced operation in 2012 and ceased mining in 2022.